Question

select the correct answer. carter pushes a bag full of basketball jerseys across the gym floor. then he pushes with a constant force of 21 newtons. if he pushes the bag 9 meters in 3 seconds, how much power does he use? (hint 1 watt = 1 \\(\frac{n\cdot m}{s}\\)). a. 3 watts b. 7 watts c. 27 watts d. 63 watts e. 189 watts

Explanation:

Step1: Calculate work done

$W = F \times d = 21\ \text{N} \times 9\ \text{m} = 189\ \text{N·m}$

Step2: Calculate power

$P = \frac{W}{t} = \frac{189\ \text{N·m}}{3\ \text{s}} = 63\ \text{watts}$

Answer:

D. 63 watts